1982 D
(a) Draw the Lewis electron-dot structures for CO32-, CO2 and CO, including resonance
structures where appropriate.
(b) Which of the three species has the shortest C-O bond length? Explain the reason for
your answer.
(c) Account for the fact that the carbon-oxygen bond length in CO32– is greater than the
carbon-oxygen bond length in CO2.
1989 D
CF4
XeF4
ClF3
(a) Draw a Lewis electron-dot structure for each of the molecules above and identify
the shape of each.
1990 D
Use simple structure and bonding models to account for each of the following:
(a) The bond length between the two carbon atoms is shorter in C2H4 than in C2H6.
(b) All the bond lengths in SO3 are identical and are shorter than a sulfur-oxygen single
bond.
1992 D
NO2
NO2NO2+
Nitrogen is the central atom in each of the species given above.
(a) Draw the Lewis electron-dot structure for each of the three species.
2004 Question 7
Use appropriate chemical principles to account for each of the following observations. In
each part, your response must include specific information about both substances.
(b) The shape of the ICl4- ion is square planar, whereas the shape of the BF4- ion is
tetrahedral.
Answer the following questions that relate to chemical bonding.
(a) In the boxes provided, draw the complete Lewis structure (electron-dot diagram) for
each of the three molecules represented below.
CF4
PF5
SF4